Extrusion-press



0. B JACOBSEN. EXTRUSION PRESS.

APPLICATION FILED SEPT.12, I918.

Patented Dec. 13,1921.

2 SHEETS-SHEET l- O. B JACOBSEN.

EXTRUSION PRESS.

APPLICATION mw SEPT. 1 2, 1918.

7 1,400,071.. I Patented Dec. 13, 1921.

2 SHEETS-SHEET 2 is adapted to be extruded; b' is the die UNITED STATES PATENT OFFICE.

om 1B. JACOBSEN, or rmmmenm ENGLAND.

' nxzrausron-ranss. i

To all whom it may concern:

Be it known that I, OLAF BERG JAcoBsEN, a subject of the Kingdom of Great Britain, residing at-Glenthorne, Valentine Road, Kings Heath, Birmingham, in the county of- Warwick, England, engineer, have invented certain new and useful Improvements inExtrusion-Presses, of which the following is a specification.

ThlS invention relates to an extrusion press such as is used for the manufacture of tubes and hollow sections of the type involving a rod, to the extremity of whlch a mandrel is secured, said mandrel being of diameter less than that of the rod, in which the said rod is located axially within a hollow plunger adapted to be a vanced to effect the extru sion process, and in which the said rod is withdrawable independently of the plunger. Previously, in this type of press, the rod has extruded in a backward direction through the main ram and pressure cylinder to an auxiliary pressure cylinder. According to the present invention, in this type of press I utilize in lieu of the said rod, a plunger which is secured to the main ram and is adapted to exert a proportionvof the extrusion pressure. The said hollow plunger is in this invention also adapted to be operated by the main ram.

In order that this invention may be clearly understood and readilyl carried into practice, reference may be d to the appended explanatory drawing, on-which Figure 1 is apart elevation of an extrusion press according to the present invention. Fig. 2 is a part sectional elevation of the extrusion press shown in Fig. 1. Fig. 3 is a plan, partly in section, of the same. a

In a convenient embodiment of the present invention, and referring to the draw;-

ings, a is the container from which the metalthrough which the metal is extruded, and which is retained in position in relation to the container by any suitable provision.

by which the latter is adapted to be retained b is a centralizing nipple for the front extrem Patented Dec. 13, 1921.

' Application flle l September 12,1918. Serial No, 253,778

in effective engagement with the die 6, which latter is supported by a holder A transverse slide n is located in the opening j,

said slide 12. having a perforation through which the extruded tube may pass. Said slide is adapted to be moved into and out of position by any suitable means, such, as a double actmgram. This slide when in .pos1t1on functions as a resistance between which and the container the die and its,

holder are securely clamped or gripped during the extrusion process. Rams for releasing the container, from the die are indicated at k. The mandrel a is secured to a thrust member 03, which latter is in turn secured to the main ram e. f is a sleeve encircling the thrust member all, said sleeve being secured to a cross-head 9 adapted to be displaced forwardly by the main ram, and which is coupled to auxiliary rams, the cylinders 72. of which are located above and below the cylinder of the main ram.

From the drawing, it will be seen that the thrust member 03 and sleeve 7 together constitute the two parts of a composite extrusion plunger, n being the usual pad incorporated between the plunger and the metal to be extruded, and 0 being a ring which may be located between thepad n and the sleeve .f. The sleeve f is slidable onthe thrust member (Z, and is of such form that its front face is in the plane of the front face of the thrust member f during the extrusion movement. The mandrel pro ecting from the front face of the thrust member 03 being of a smaller diameterthan said member (1, occupies only a small part of the cross-sectional area of the I container and both the inner and outer parts at, f of the plunger are adapted to movethrough a distance equal substantially tothe whole length of the container chamber.

At the end of the'machine remote from the die an axially located 'strippingram. p

is adapted to move in' its power stroke in a direction away from the die and carries a cross-head'g to which rods Z are coupled; these rods Z are coupled at their other extremities to bosses m upon the mam ramv and serve to effect the reverse movement of the latter. 3 r I In operation the imam ram e and auxiliary rams in thecylinders h move forwardly to gether and collectively displace the crosshead g, as a result ofwhich the thrust member 03, mandrel c, and sleeve f are collectively displaced to extrude the metal without any relative movement occurring between these parts. When the tube has been extruded the cylinders of the main ram e and the cylinders.

7 forwardly independently of the main ram. I As a result of this action the unextruded portion of the tube is expelled from the container. At about the same time pressure is admitted to the. cylinder of the stripping ram, which latter through the medium qf the rods Z is adaptedto displace the main ram rearwardly to its initial position, as a result of which the tube is stripped from the mandrel 0. Pressure is then admitted to the cylinders h in the manner necessary to efiect a rearward movement of the crosshead g, as a result of which the sleeve 7 is restored to its initial position. To ermit of this the rams in the cylinders in are oubleacting.

What I claim as m invention and desire to secure by Letters atent is 2- 1. An extrusion press, involving a plunger, to the extremity of which a mandrel is secured, said mandrel being of diameter less than that of the plunger, in which the said plunger is located axially within a hollow plunger, and in which the plunger first mentioned is adapted to exert a proportion of the extrusion pressure.

2. An extrusion press as claimed in the first claim, and in which the plunger first mentioned and also the said hollow plunger, are adapted tobe operated by the main ram. 3,. Anextrusion press as claimed in the first claim, and in which a relative movement is permissible between the plunger first mentioned and the hollow plunger adapted to provide for the stripping ofthe work from the mandrel.

4. In an extrusion ress, a container for the metal to be extru ed, a d1e to close one end of the container, means to hold the die, a nipple arranged in the die and adapted to be dislodged therefrom by the extruded metal, means to release the container from the die, a cross head, guides. therefor, means to operate the cross head, a thrust member, a ram to impart extruding movement to the thrust member and corresponding movement to the cross head, a sleeve carried by the cross head. and arranged around and slidable on the thrust member andcoacting therewith to form an extrusion plunger which is adapted to enter the container, meansindependent of said ram to operate the cross head and sleeve, a pad on the outer end of the thrust member and arranged to enter the container, and a mandrel attached to the thrust member and extending through the pad, the container and the die, and also extending into an opening in the nipple.

In witnessfwhereof I have hereunto set my hand in the presence of two witnesses. V O. B. JACOBSEN.

.WVitnesses ARTHUR H. BROWN,

EDGAR N. WHEELER. 

